These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.88 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "dev-util/hip:0/7.1" has unmet requirements.
- dev-util/hip-7.1.0-r1::gentoo USE="hip -debug -doc -numa (-opencl) -test" LLVM_SLOT="20" VIDEO_CARDS="-amdgpu -nvidia"

  The following REQUIRED_USE flag constraints are unsatisfied:
    exactly-one-of ( video_cards_amdgpu video_cards_nvidia )

  The above constraints are a subset of the following complete expression:
    any-of ( hip opencl ) exactly-one-of ( video_cards_amdgpu video_cards_nvidia ) exactly-one-of ( llvm_slot_20 )

(dependency required by "sci-libs/hipSOLVER-7.1.0::gentoo" [ebuild])
(dependency required by "=sci-libs/hipSOLVER-7.1.0" [argument])